Articles | Volume 28, issue 18
https://doi.org/10.5194/hess-28-4309-2024
https://doi.org/10.5194/hess-28-4309-2024
Research article
 | 
20 Sep 2024
Research article |  | 20 Sep 2024

Using high-frequency solute synchronies to determine simple two-end-member mixing in catchments during storm events

Nicolai Brekenfeld, Solenn Cotel, Mikaël Faucheux, Paul Floury, Colin Fourtet, Jérôme Gaillardet, Sophie Guillon, Yannick Hamon, Hocine Henine, Patrice Petitjean, Anne-Catherine Pierson-Wickmann, Marie-Claire Pierret, and Ophélie Fovet

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Subject: Catchment hydrology | Techniques and Approaches: Instruments and observation techniques
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Revised manuscript accepted for HESS
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Cited articles

Anderson, S., Dietrich, W. E., Torres, R., Montgomery, D. R., and Loague, K.: Concentration-discharge relationships in runoff from a steep, unchanneled catchment, Water Resour. Res., 33, 211–225, https://doi.org/10.1029/96WR02715, 1997. 
Aquilina, L., Poszwa, A., Walter, C., Vergnaud, V., Pierson-Wickmann, A.-C., and Ruiz, L.: Long-Term Effects of High Nitrogen Loads on Cation and Carbon Riverine Export in Agricultural Catchments, Environ. Sci. Technol., 46, 9447–9455, https://doi.org/10.1021/es301715t, 2012. 
Aubert, A. H., Gascuel-Odoux, C., Gruau, G., Akkal, N., Faucheux, M., Fauvel, Y., Grimaldi, C., Hamon, Y., Jaffrézic, A., Lecoz-Boutnik, M., Molénat, J., Petitjean, P., Ruiz, L., and Merot, P.: Solute transport dynamics in small, shallow groundwater-dominated agricultural catchments: insights from a high-frequency, multisolute 10 yr-long monitoring study, Hydrol. Earth Syst. Sci., 17, 1379–1391, https://doi.org/10.5194/hess-17-1379-2013, 2013. 
Ávila, A., Piñol, J., Rodà, F., and Neal, C.: Storm solute behaviour in a montane Mediterranean forested catchment, J. Hydrol., 140, 143–161, https://doi.org/10.1016/0022-1694(92)90238-Q, 1992. 
Ayraud, V., Aquilina, L., Labasque, T., Pauwels, H., Molenat, J., Pierson-Wickmann, A.-C., Durand, V., Bour, O., Tarits, C., Le Corre, P., Fourre, E., Merot, P., and Davy, P.: Compartmentalization of physical and chemical properties in hard-rock aquifers deduced from chemical and groundwater age analyses, Appl. Geochem., 23, 2686–2707, https://doi.org/10.1016/j.apgeochem.2008.06.001, 2008. 
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Short summary
The proposed methodology consists of simultaneously analysing the concentration variation of solute pairs during a storm event by plotting the concentration variation of one solute against the variation of another solute. This can reveal whether two or more end-members contribute to streamflow during a storm event. Furthermore, the variation of the solute ratios during the events can indicate which catchment processes are dominant and which are negligible.
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